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It does actually leak information in the form of ad prices and view rates. Not directly to he public, but it is leaked.

Is a "share" a subset of a "like"? Maybe they can have links count as shares but not likes.

So your issue here isn't a privacy one at all, it's a semantic one.

Lesson learned: stop linking to evil content.

Wonder if this will exacerbate the effect of everyone only seeing views that agree with theirs and decreasing exposure to different (/evil) perspectives.

Personally I'd be happy with fewer "look at this idiot" links, whether they be on Facebook or HN. If its more of a "something to think about" link, even if I disagree, I think I'm ok if their like count goes up when I share it.